Solder shorts
Shorts between tracks as a result of incomplete etching
Broken track as a result of etching working TOO well
Component put in the wrong way round
Fried op-amps
Wrong value components (too high resistors?)
Power supply voltages are correct
Power is getting to all parts of circuit.

Yeah,
definately check every setting as there are a number of ways you can get the SL to output nothing.
Also check the wiring of pots, especially the mixer section.
Don't overlook the possibility that you mis-read a resistor code. I still do it from time to time!
Good luck.
P.S. if you don't find it in the next couple of hours of investigating, re-post, have a break, and we'll get out the big guns!_________________What makes a space ours, is what we put there, and what we do there.

Check whether the signal tester shows Osc1 going into the mixer pot (for Osc1) if it does, check what's coming out (ie from the wiper of that pot) a faulty pot can literally disconnect the wipers from the track inside._________________What makes a space ours, is what we put there, and what we do there.

I would also recommend you verify the ground connection of r-27. I just finished building my soundlab last night (pictures soon), and had a very similar experience to yours. My symptoms were a pseudo random oscillation / bleed through of LFO signal (free running) as well as a reversal of the main output potentiometer operation. That is to say when I turned down the output it went UP! This afternoon I looked at that part of the circuit and discovered that I had overlooked this connection. R-27 was "floating", as well as all the rest of the front panel pots and switches wired to it. I think I inadvertently discovered a new "chaos" mod for the thing (lol).

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